1925 in Australia

Incumbents

• Monarch – George V
• Governor-General – Henry Forster, 1st Baron Forster then John Baird, 1st Viscount Stonehaven
• Prime Minister – Stanley Bruce
• Chief Justice – Adrian Knox

  State premiers

• Premier of New South Wales – George Fuller, then Jack Lang
• Premier of Queensland – Ted Theodore, then William Gillies, then William McCormack
• Premier of South Australia – John Gunn
• Premier of Tasmania – Joseph Lyons
• Premier of Victoria – John Allan
• Premier of Western Australia – Philip Collier

  State governors

• Governor of New South Wales – Sir Dudley de Chair
• Governor of Queensland – Sir Matthew Nathan
• Governor of South Australia – Sir Tom Bridges
• Governor of Tasmania – Sir James O'Grady
• Governor of Victoria – George Rous, 3rd Earl of Stradbroke
• Governor of Western Australia – Sir William Campion

  Events

• 26 January – Australia's oldest commercial radio station, 2UE, begins broadcasting in Sydney.
• 20 May – The Murrumbidgee River floods for eight days killing four people, as up to falls in its upper catchment.
• 30 May – Millicent Preston-Stanley becomes the first woman member of the New South Wales Legislative Assembly.
• 1 to 31 May – Canberra records its wettest month on record with at Acton and at Duntroon Military College.
• 3 June – A general election is held in Tasmania. The Labor government of Joseph Lyons is returned in a landslide victory.
• 9 June – Ten people are killed in a derailment near Traveston railway station, Queensland
• 1 September – Thomas Blamey becomes Chief Commissioner of Victoria Police.

  Science and technology

• The Cactoblastis moth is introduced in Queensland to control prickly pear cactus.

  Arts and literature

• John Longstaff wins the Archibald Prize for his portrait of Maurice Moscovitch

  Sport

• Victoria wins the Sheffield Shield
• 2 May – Footscray, Hawthorn and North Melbourne play their initial Victorian Football League matches.
• 8 August – South Sydney record the only perfect season in NSWRFL history, winning all twelve of their matches.
• 26 September – Geelong defeats Collingwood 10.19 to 9.15, becoming premiers of the 1925 VFL season.
• 3 November – Windbag wins the Melbourne Cup.

  Births

• 14 January – Ray Wilkie, meteorologist
• 8 February – Francis Webb, poet
• 10 February – Basil Hennessy, archaeologist
• 11 February – George Avery, Olympic triple jumper
• 12 February – Ted Innes, politician
• 17 February – Joy Nichols, comedian and actress
• 20 February – Pat Lanigan, public servant
• 19 March – Creighton Burns, journalist and editor-in-chief of The Age
• 27 March – Ian Robinson, politician
• 4 April – Dorothy Alison, actress
• 21 April – Anthony Mason, Chief Justice of the High Court
• 2 May – Lou Rowan, Test cricket match umpire
• 19 May – Brian Moll, character actor, director and producer
• 24 May – Alfred Parsons, diplomat
• 3 June – David Evans, air marshal
• 4 June – Peter Benjamin Graham, artist
• 3 July – Terry Moriarty, Australian rules footballer
• 6 July – Ruth Cracknell, actor
• 18 July
• *Raymond Jones, architect
• *Shirley Strickland, athlete
• 26 July – Neil O'Reilly, Australian rules footballer
• 19 August – Laurie Sawle, cricketer
• 21 August – Don Chipp, politician and founder of the Australian Democrats
• 24 August – Duncan Hall, rugby league footballer of the 1940s and 1950s
• 27 August – Fred Emery, psychologist
• 27 August – Ken Grieves, cricketer
• 27 August – Bill Neilson, Premier of Tasmania
• 24 September – Harry Jenkins, politician
• 4 October – Renfrey Potts, mathematician
• 5 October – Murray Riley, Olympic rower
• 18 October – Thomas Millar, historian
• 24 October – Ken Mackay, cricketer
• 5 November – Rhonda Small, filmmaker
• 17 November – Charles Mackerras, conductor
• 23 November – James Killen, politician
• 10 December – Norm McDonald, Australian rules footballer

  Deaths

• 24 January – William Aitcheson Haswell, zoologist
• 4 February – Richard Godfrey Rivers, artist
• 23 February – John Holman, Western Australian politician
• 1 March – John Ferguson, minister
• 16 April – Thomas McCawley, 5th Chief Justice of Queensland
• 20 April – Rose Scott, suffragette
• 28 April – Sir Richard Butler, 23rd Premier of South Australia
• 22 June – Matthew Gibney, bishop
• 27 June – Simpson Newland, South Australian politician, pastoralist and author
• 18 July – Edward Russell, Victorian politician
• 26 July – William Trenwith, 1st Leader of the Victorian Labor Party
• 30 August – Magnus Cromarty, New South Wales politician
• 5 September – Reginald Augustus Frederick Murray, geologist and surveyor
• 6 or 8 September– Louisa Briggs, Aboriginal Australian rights activist, dormitory matron, midwife and nurse recognized as five apical ancestors from whom Boonwurrung descent is established
• 28 September – Joseph Brown, Victorian politician
• 3 October – Charles Web Gilbert, sculptor
• 24 October – Charles Kenningham, opera singer and actor
• 4 November – Paddy Hannan, prospector
• 13 November – Charles McDonald, Queensland politician
• 16 November – Joseph Maiden, botanist